In this episode, our teams (the Brainy Bunch &
In A Spin) have mere hours (well, 10) to build gliders. They must carry
one passenger (the pilot) and the winner is determined by who can stay
in the air the longest, not by distance flown.

A glider is an airplane with no engine. Gliders
must be towed (or launched) into the air and stay aloft until gravity takes
over and they, hopefully, land back on earth. They stay up by lift generated
through air pressure. Air passing over the top of the wing must travel
faster than the air at the bottom of the wing. This creates highe air pressure
under the wing, creating lift. The same principle applies to hang-gliders
where the passenger(s) are suspended under one giant wing.